<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const arr = [
        { id: "29", pid: "", name: "总裁办" },
        { id: "2c", pid: "", name: "财务部" },
        { id: "2d", pid: "2c", name: "财务核算部" },
        { id: "2f", pid: "2c", name: "薪资管理部" },
        { id: "d2", pid: "", name: "技术部" },
        { id: "d3", pid: "d2", name: "Java研发部" }
      ];
      function filterArr(list,pid = ''){
          let newArr = list.filter(item => item.pid === pid)
        //   console.log(newArr);
        newArr.forEach(item => {
            item.children = filterArr(list,pid = item.id)
        })
        return newArr
      }
      const list =  filterArr(arr)
      console.log(list);
    </script>
  </body>
</html>
